43 lines
1.0 KiB
C++
43 lines
1.0 KiB
C++
#include <iomanip>
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#include <cmath>
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#include "point.h"
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#include "line.h"
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// A helper function to calculate the slope of a Line.
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std::ostream& operator<< (std::ostream &ostr, const Line &l) {
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ostr << "Road: "
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<< l.get_a() << " ----- " << l.get_b()
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<< " gradient = "
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<< std::fixed << std::setprecision(1) << std::setw(4)
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<< gradient(l);
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return ostr;
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}
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// A helper function to calculate the gradient of a Line.
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double gradient(const Line &ln) {
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float slope = compute_slope(ln.get_a(),ln.get_b());
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// convert the slope into a percentage gradient
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float gradient = 100.0 * fabs(slope);
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// take the absolute value
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if (gradient < 0) {
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gradient * -1;
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}
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return gradient;
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}
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// A helper function to compare the gradient of two Lines.
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// (That can be used to sort a collection of roads.)
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bool steeper_gradient(const Line &m, const Line &n) {
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double gradient_m = gradient(m);
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double gradient_n = gradient(n);
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if (gradient_m > gradient_n)
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return true;
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if (gradient_n > gradient_m)
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return false;
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}
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